Question

Suppose X is a random variable with expected value 260 and standard deviation 120, and Y...

Suppose X is a random variable with expected value 260 and standard deviation 120, and Y is a random variable with expected value 170 and standard deviation 70. Compute each of the means and standard deviations indicated below (round off your answers to two decimal places, if necessary).

E(1.7X)=
SD(1.7X)=
SD(X+Y)=
E(X−Y)=
SD(X−Y)=



Now let Y1 and Y2 be two instances of the random variable YY and compute the following (again, rounding to two decimal places, if necessary).

E(Y1+Y2)=
SD(Y1+Y2)=
E(Y1−Y2)=
SD(Y1−Y2)=

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